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16篇 您的检索式:作者名="D.Kumar"
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1P3: An installation for high-energy density plasma physics and ultra-high intensity laserematter interaction at ELI-Beamlines显示文摘ELI-Beamlines(ELI-BL),one of the three pillars of the Extreme Light Infrastructure endeavour,will be in a unique position to perform research in high-energy-density-physics(HEDP),plasma physics and ultra-high intensity(UHI)ð>10^(22) W=cm^(2)) lasereplasma interaction.Recently the need for HED laboratory physics was identified and the P3(plasma physics platform)installation under construction in ELI-BL will be an answer.The ELI-BL 10 PW laser makes possible fundamental research topics from high-field physics to new extreme states of matter such as radiation-dominated ones,high-pressure quantum ones,warm dense matter(WDM)and ultra-relativistic plasmas.HEDP is of fundamental importance for research in the field of laboratory astrophysics and inertial confinement fusion(ICF).Reaching such extreme states of matter now and in the future will depend on the use of plasma optics for amplifying and focusing laser pulses.This article will present the relevant technological infrastructure being built in ELI-BL for HEDP and UHI,and gives a brief overview of some research under way in the field of UHI,laboratory astrophysics,ICF,WDM,and plasma optics.S.Weber S.Bechet S.Borneis L.Brabec M.Bucka E.Chacon-Golcher M.Ciappina M.DeMarco A.Fajstavr K.Falk E.-R.Garcia J.Grosz Y.-J.Gu J.-C.Hernandez M.Holec P.Janecka M.Jantac M.Jirka H.Kadlecova D.Khikhlukha O.Klimo G.Korn D.Kramer D.Kumar T.Lastovicka P.Lutoslawski L.Morejon V.Olsovcova M.Rajdl O.Renner B.Rus S.Singh M.Smid M.Sokol R.Versaci R.Vrana M.Vranic J.Vyskocil A.Wolf Q.Yu 2017Matter and Radiation at Extremes2017,2,4:8
2硬脂酸处理提高植酸包覆镁的耐腐蚀性能(英文)显示文摘将镁浸泡在植酸溶液中,在其表面形成一层化学转化膜。然后再将其浸泡在硬脂酸溶液中以改善植酸转化膜的显微组织和抗腐蚀性能。经过硬脂酸溶液浸泡处理后,转化膜未出现裂纹,试样表面变得光滑。采用电化学方法研究其腐蚀行为。结果表明,经硬脂酸溶液浸泡处理的试样比未经浸泡处理的和没有转化膜的试样具有更高的耐腐蚀性能。因此,硬脂酸溶液处理能够增强镁的耐腐蚀性能。R.K.GUPTA K.MENSAH-DARKWA J.SANKAR D.KUMAR 2013Transactions of Nonferrous Metals Society of China2013,23,5:6
3New Exact Traveling Wave Solutions of the Unstable Nonlinear Schrdinger Equations显示文摘The present paper studies the unstable nonlinear Schr¨odinger equations, describing the time evolution of disturbances in marginally stable or unstable media. More precisely, the unstable nonlinear Schr¨odinger equation and its modified form are analytically solved using two efficient distinct techniques, known as the modified Kudraysov method and the sine-Gordon expansion approach. As a result, a wide range of new exact traveling wave solutions for the unstable nonlinear Schr¨odinger equation and its modified form are formally obtained.K.Hosseini D.Kumar M.Kaplan E.Yazdani Bejarbaneh 2017Communications in Theoretical Physics2017,67,12:5
4Corrosion Protective Conversion Coatings on Magnesium Disks Using a Hydrothermal Technique显示文摘A uniform,compact,and well adherent conversion coating of magnesium hydroxide has been formed on bioresorbable magnesium disks by means of a hydrothermal technique Electrochemical results indicate that the coating brings about a significant reduction in magnesium corrosion in phosphate buffered saline(PBS)solution.It is also observed that corrosion resistance of the coating increases with an increase in treatment time,which in turn,increases the coating thickness.The protective behavior of magnesium hydroxide coating is attributed to its chemical inertness in PBS solution.The coatings are found to be free from pores that reduce the direct contact between corroding media and underlying magnesium.R.K.Gupta K.Mensah-Darkwa D.Kumar 2014Journal of Materials Science & Technology2014,30,1:3
5Risk factors for anastomotic failure after total mesorectal excision of rectal cancer (Br J Surg 2005; 92: 211‐216)显示文摘C.Evans R.Boden I. R.Daniels D.Kumar 2005Br J Surg2005,,6:2
6采用热喷涂进行金属陶瓷复合材料的近净成形显示文摘现代技术的发展导致了具有特定机械性能的金属陶瓷复合材料的出现。但主要困难是高度复杂和昂贵的加工技术。热喷涂成形技术可能是解决该问题的途径,由于它的高度灵活性,低的造价和相对简单的等原因。用热喷涂技术进行复合材料的近净成形方法包括现场喷涂,压实和烧结一体化的工艺。利用可移去型芯技术可产生不同的形状。当采用丝材或粉末形式的铝合金作为基体材料时,两种粒子增强相(SiC和Al2O3)的添加量可达50%的体积百分比。已实现了双枪喷涂技术(电弧-HVOF,电弧-火焰)和单枪喷涂技术(HVOF,火焰喷涂)。用这种技术加工的模型有锥体,喷嘴和内燃发动机排气孔的衬套等,这些部件正在接受鉴定。D.Kumar S.C.Mod 朱有利 1997表面工程1997,,4:2
7铁磁流体润滑理论显示文摘J.B.SHUKLA D.KUMAR 许孙曲 1990润滑与密封1990,,02:1
8Predicting uncertain behavior of industrial system using FM:a practical case显示文摘R.K.Sharma D.Kumar P.Kumar 0,,01:1
9铁磁流体润滑理论显示文摘J.B.SHUKLA D.KUMAR 许孙曲 1990润滑与密封1990,,02:1
10Risk factors for anastomotic failure after total mesorectal excision of rectal cancer (Br J Surg 2005; 92: 211‐216)显示文摘C.Evans R.Boden I. R.Daniels D.Kumar 2005Br J Surg2005,,6:1
11Preoperative staging of rectal carcinoma显示文摘A. G.Heriot A.Grundy D.Kumar 2003Br J Surg2003,,1:1
12Design,installation and commissioning of the ELI-Beamlines high-power,high-repetition rate HAPLS laser beam transport system to P3显示文摘The design and the early commissioning of the ELI-Beamlines laser facility’s 30 J,30 fs,10 Hz HAPLS(High-repetitionrate Advanced Petawatt Laser System)beam transport(BT)system to the P3 target chamber are described in detail.It is the world’s first and with 54 m length,the longest distance high average power petawatt(PW)BT system ever built.It connects the HAPLS pulse compressor via the injector periscope with the 4.5 m diameter P3 target chamber of the plasma physics group in hall E3.It is the largest target chamber of the facility and was connected first to the BT system.The major engineering challenges are the required high vibration stability mirror support structures,the high pointing stability optomechanics as well as the required levels for chemical and particle cleanliness of the vacuum vessels to preserve the high laser damage threshold of the dielectrically coated high-power mirrors.A first commissioning experiment at low pulse energy shows the full functionality of the BT system to P3 and the novel experimental infrastructure.S.Borneis T.Laštovickaˇ M.Sokol T.-M.Jeong F.Condamine O.Renner V.Tikhonchuk H.Bohlin A.Fajstavr J.-C.Hernandez N.Jourdain D.Kumar D.Modranskýˇ A.Pokorný A.Wolf S.Zhai G.Korn S.Weber 2021High Power Laser Science and Engineering2021,9,2:0
13GENERALIZED FRACTIONAL CALCULUS OF THE ALEPH-FUNCTION INVOLVING A GENERAL CLASS OF POLYNOMIALS显示文摘The object of this article is to study and develop the generalized fractional calculus operators given by Saigo and Maeda in 1996. We establish generalized fractional calculus formulas involving the product of ■-function, Appell functionF3 and a general class of polynomials. The results obtained provide unification and extension of the results given by Saxena et al. [13], Srivastava and Grag [17], Srivastava et al. [20], and etc. The results are obtained in compact form and are useful in preparing some tables of operators of fractional calculus.On account of the general nature of the Saigo-Maeda operators, ■-function, and a general class of polynomials a large number of new and known results involving Saigo fractional calculus operators and several special functions notablyH-function,I-function, Mittag-Leffler function, generalized Wright hypergeometric function, generalized Bessel-Maitland function follow as special cases of our main findings.R.K.SAXENA D.KUMAR 2015Acta Mathematica Scientia2015,35,5:0
14The L4n laser beamline of the P3-installation:Towards high-repetition rate high-energy density physics at ELI-Beamlines显示文摘The P3 installation of ELI-Beamlines is conceived as an experimental platform for multiple high-repetition-rate laser beams spanning time scales from femtosecond via picosecond to nanosecond.The upcoming L4n laser beamline will provide shaped nanosecond pulses of up to 1.9 kJ at a maximum repetition rate of 1 shot/min.This beamline will provide unique possibilities for high-pressure,high-energy-density physics,warm dense matter,and laser–plasma interaction experiments.Owing to the high repetition rate,it will become possible to obtain considerable improvements in data statistics,in particular,for equation-of-state data sets.The nanosecond beam will be coupled with short sub-picosecond pulses,providing high-resolution diagnostic tools by either irradiating a backlighter target or driving a betatron setup to generate energetic electrons and hard X-rays.N.Jourdain U.Chaulagain M.Havlik D.Kramer D.Kumar V.T.Tikhonchuk G.Korn S.Weber 2021Matter and Radiation at Extremes2021,6,1:0
15Design and Robustness Analysis of a Wave-Based Controller for Tethered Towing of Defunct Satellites显示文摘Dear Editor, A microgravity environment in space, the elasticity of the tether,and complex flexible appendages make the tethered-towing system a nonlinear and underactuated system, which is sensitive and difficult to stabilize. This letter develops a controller based on wave propagation for tethered towing of defunct satellites, and carries out a robustness analysis of the controller via numerical simulation.Rui Qi Yang Zhang Krishna D.Kumar 2023IEEE/CAA Journal of Automatica Sinica2023,10,1:0
16800kV高压直流输电应用技术和开发显示文摘目前,在全世界现有的高压直流输电方案中,最高电压水平限于500~600kV之间。因此,在超高压直流输电站主要设备的设计中,须对稳态和暂态电压应力增加所产生的影响加以审慎研究。文章重点论述了拟定的关键超高压直流输电设备和系统的具体设计。还对最新的高压直流输电设备技术及其在超高压直流输电系统中的应用进行了详细说明和讨论,并列举了一些研发项目的实例。M.Haeusler H.Huang V.Ramaswami D.Kumar 2007电力设备2007,8,6:0
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